Backfill machine



p 9, 1967 D. B. SALE 3,342,035

BACKFILL MACHINE Filed Dec. 28, 1964 6 Sheets-Sheet l FINGER DRAIN WEEP VALVE FLOWER POT DRAIN INVENTOR. DWIGHT 8. SALE ATTORNEYS Sept. w, 1967 D. B. SALE BACKFILL MACHINE 6 Sheets-Sheet 2 Filed Dec. 28, 1964 INVENTOR. DWIGHT 8. SALE ATTORNEYS Sept. 19, 1967 D. B. SALE 3,342,035

BACKFILL MACHINE Filed Dec. 28, 1964 6 SheetsSheet 3 INVENTOR DWIGHT 8. SALE BY x/ 4,

ATTORNEYS Sept 19, 1%? D. B. SALE 3,342,035

BACKFILL MACHINE Filed Dec. 28, 1964 6 Sheets-Sheet 4 I NVENTOR.

DWIGHT B. SALE BY J WM ATTORNEYS m. B. smu 3 342,%5

BACKFILL MACHINE Filed Dec. 28, 1964. 6 Sheets-Sheet 5 f M V INVENTOR.

' DWiGHT 8. SALE El 3 a uihm ATTORNEYS Sept. 19, W67

D. B. SALE 3,342,035

BACKFILL MACHINE Filed Dec. 28, 1964 6 Sheets-Sheet 6 IPNVENTOR, DWHGHT 9. SALE ATTORNEYS United States Patent 3,342,035 BACKFILL MACHINE Dwight E. Sale, San Mateo, Calif., assignor to Guy F.

Atkinson Company, South San Francisco, Calif., a corporation of Nevada Filed Dec. 28, 1964, Ser. No. 421,446 9 Claims. (Cl. 61-63) This invention relates generally to a canal construction and more particularly to a machine and method for backfilling protective drains incorporated in canals.

Large concrete lined canals are built to transport and distribute water from dams which store winter-time water for utilization in farm lands and cities. More recent water projects have required relatively large canals. These large canals necessitate new machinery and new construction techniques to permit economical construction of such canals.

In one such canal, the bottom or invert was 110 ft. across and the sloping walls were 83 ft. wide. With such large dimensions, the bottom of the canal can be well below the ground water level. If the water level in the canal falls below the level of the outside ground water, large forces are developed which may cause rupture of the canal lining.

In order to prevent such rupture, protective drains are disposed beneath the lining. These drains include finger drains which extend along the slope of the canal at predetermined intervals. The drains comprise trenches which are filled with compacted material such as sand which provides good drainage while offering a support for the concrete lining. One-way valves, known as weep valves since they permit outside water to flow into the canal, extend through the lining and communicate with the drain so as to drain water into the canal when the water level is below the ground level. A so-called flowerpot filled with compacted sand having a gravel core is preferably employed for receiving the weep valve.

Longitudinal drains may also be provided to stabilize the bank and to protect the lining. Thus, bank stability drain may be incorporated within the bank and include compacted sand having a gravel core serving to accommodate a drainage pipe. A lining protective drain may extend along the bottom of the slope and also comprise compacted sand having a gravel core. Weep valves may communicate with the lining protective drain at spaced intervals.

The excavation of finger drain trenches and flowerpot holes presents unique problems because of the size and slope of the canal wall. Special machines may be provided for the purpose of digging the finger drains and flowerpots. Conventional trenching machines may be employed for excavating the longitudinal trenches.

It is a general object of the present invention to provide a machine for backfilling protective drains.

It is another object of the present invention to provide a backfill machine for backfilling protective drains with zones or regions of diiferent materials.

It is a further object of the present invention to provide a machine for delivering and placing two different materials in longitudinal trenches.

It is a further object of the present invention to provide a machine for delivering and placing zones of dissimilar material in a round hole or flowerpot.

It is a further object of the present invention to provide a machine capable of filling a longitudinal trench with compacted sand having a gravel core.

It is still a further object of the present invention to provide a self-propelled machine adapted to travel along a trench to backfill the same with different materials.

It is a further object of the present invention to provide a machine for conveying dissimilar material from a canal bank down the slopes to backfilling apparatus disposed on the sides and bottom of the canel.

It is still a further object of the present invention to provide a machine in which dissimilar materials are conveyed from a source of material to a means for delivering the dissimilar materials to an excavation in a predetermined relationship.

These and other objects of the invention will become more clearly apparent from the following description taken in conjunction with the accompanying drawings.

Referring to the drawings:

FIGURE 1 is a perspective view of a portion of the bottom of a canal and sides of the same showing a finger drain trenches and flowpot digger supported on a truss for travel along the canal followed by a backfill machine in accordance with the invention;

FIGURE 2 is an enlarged sectional view of a portion of a lined canal showing bank stability, lining protective, finger and flower pot drains;

FIGURE 3 shows a back View of machinery for delivering materials to travelling storage bins which supply material to the backfill unit;

FIGURE 4 is a side elevation view of a backfill machine in accordance with one embodiment of the invention with the rails and cable omitted for clarity;

FIGURE 5 is a plan view of the machine shown in FIGURE 4 with part of the conveyor to the finger drain backfill shown;

FIGURE 6 is a view taken generally along the line 66 of FIGURE 4;

FIGURE 7 is a view taken generally along the line 77 of FIGURE 4 showing the longitudinal lining protective drain backfill portion of the machine;

FIGURE 8 is an end view taken generally along the line 88 of FIGURE 7 showing a rear view of the multiple lift longitudinal lining protective drain backfill portion of the machine;

FIGURE 9 is a side elevational view, partly in section, of a flowerpot backfill unit;

FIGURE 10 is an end elevational view of the flowerpot backfill unit of FIGURE 9;

FIGURE 11 is a plan view of the flowerpot backfill unit;

FIGURE 12 is a sectional View taken generally along the line 1212 of FIGURE 9;

FIGURE 13 is a side elevational view of a stability drain backfill machine;

FIGURE 14 is a plan view of the stability drain backfill machine of FIGURE 13;

FIGURE 15 is a partial view showing the means for delivering different materials in the bank stability trench backfill machine;

FIGURE 16 shows a typical section of a completed bank stability drain; and

FIGURE 17 shows a bank stability trench backfill machine with associated conveying means.

Generally, the backfill machine of the present invention provides for delivering different materials to excavated trenches and/or holes and to fill such trenches and/or holes with contiguous zones or regions of dilterent material. More particularly, the machine is adapted to backfill longitudinal trenches by delivering sand and gravel to the trenches to fill the trenches with sand and gravel core, and the flowerpots by delivering sand and gravel to fill the hole with sand and a gravel core. Generally, this is accomplished by providing means extending in the holes or trenches to deliver separately two different materials. The machine is also adapted to transport ma terial from the bank of the canal to the backfill units.

Referring to FIGURE 1, there is shown a truss 11 supported at opposite ends by self-propelling tracks 12 and 13. The upper track 12 rides along the top of the canal, while the lower track 13 rides along the bottom of the canal to move the truss 11 longitudinally along the canal.

A digging wheel 14 and a drive apparatus 16- are mounted on the truss for movement along the truss. The trencher is propelled up and down the truss by a winch. The digging wheel and motive means may be conventional trenching apparatus mounted for such movement. The digging wheel excavates the finger drain trenches and discharges the cuttings onto the bank adjacent to the trenches. Suitable means are provided for maintaining constant elevation of the truss and for accurately indexing the truss so that the level of the trenches and the spacing between the trenches is accurately maintained. On the opposite side of the framework there is mounted an auger 18 which is adapted to dig flowerpot holes such as the holes 19.

Following the finger drain and flowerpot excavating machine, there is a conventional trenching machine 21 which digs or excavates a longitudinal lining protective trench. This may, for example, be a conventional trenching machine with an offset wheel.

Following the excavating machinery, there is a backfill machine incorporating the present invention. The backfill machine includes a truss 26 supported at opposite ends by self-propelling tracks 27 and 28. The truss carries means for conveying the material from the bank to the finger drain backfill unit shown generally at 29, the flowerpot backfill unit shown generally at 31 and to the lining protective drain backfill unit shown generally at 32.

The material is delivered to the conveying means from a travelling hopper 33 which is filled from a conveyor 34. Material is dumped onto the conveyor 34 by a skip 36 which is adapted to receive material from an associated truck 37. The skip is then lifted to dump the material onto the conveyor 34 which, in turn, delivers the material to the hopper 33 for delivery to the conveying means as will be presently described.

The travelling hopper and skip unit is shown in more detail in FIGURE 3 wherein like reference numerals refer to like parts. At the upper end of the conveyor 34, there is provided a diverter 38 which serves to divert the material into its appropriate bin. Thus, the diverter 38 is actuated to place sand in a sand bin and gravel in a gravel bin. Associated with the travelling storage hopper is a water tank 39 for applying water through pipes (not shown) to the sand during the compaction operation.

Referring now more particularly to FIGURES 4 and 5, the finger drain backfill unit 29 is shown in more detail. The finger drain backfill unit includes a delivery means or spout 41 which extends down into the finger drain trench. The trailing wall of the spout forms a strike ofi for fixing the level of the material. The spout is followed by a suitable vibrator 42 for compacting the sand after it is delivered. Means (not shown) are provided for directing water into the trench to wet the sand and provide better compaction.

The delivery means 41 has material fed thereto from a conveyor belt 43. The belt receives material from a sand bind 44 and conveys the same to the tripper 46 where it falls onto a feeder 45. As seen in the drawing, the tripper includes turn around rollers 54 and 55 connected for movement with feeder conveyor 45. This general idea of trippers and tripping mechanisms is known in the conveying art as evidenced by expired Patents 396,- 500, 408,733, and 910,986. As best seen in FIGURE 6, the tripper 46 is formed by passing the conveyor belt 43 over turn-around roller 54, which lies over the feeder conveyor to invert its upper surface as at 47 so that the material is dumped onto the feeder. The inverted portion 47 of conveyor belt 43 is passed around roller located rearwardly of and below the feeder 45. The feeder 45 delivers the sand to the delivery chute 41. The continuous belt travels along rollers 48 disposed along the truss, and has a turn-around roller at the bottom and extends back to the top of the truss. Since the delivery means 41 travels along the truss as it fills the finger drains, the tripping location must move with it, therefore, the conveyor belt extends from one end of the truss to the other so the tripping can occur anywhere along its length.

The finger drain backfill unit is mounted on rails 49 and is moved along the same by suitable motive means. For example, the finger drain backfill unit 29 may be tied to a continuous cable 51 illustrated in FIGURE 5 carried by spaced sheaves 50. Suitable motive means drive the cable to pull the finger drain backfill unit up the truss. The unit is returned to the lower position by gravitational forces.

A backfill operation starts with the finger drain backfill unit at the bottom of the truss. Sand is conveyed to the unit as it is moved upwardly, delivering the sand into the trench. Water is applied to the sand and the sand is compacted.

Referring more particularly to FIGURE 4, there is provided a platform 52 including an operators seat 53 whereby an operator rides with the unit to observe and monitor the delivery. It is, of course, apparent that the transverse finger drains are backfilled when the machine is stationary. At this same time, the next preceding fiowerpot is backfilled as will be described hereinafter.

As the machine moves from one finger drain to the next, the longitudinal lining protective drain trench is backfilled. The backfill unit for the lining protective drain trench includes four consecutive delivery means which cooperate with the trench to deliver four layers or lifts of material, each layer being compacted.

The delivering means for the materials comprises delivery chutes or hoppers which extend into the trench and are spaced one behind the other in the direction of travel of the machine.

The first chute or hopper 61, FIGURES 7 and 8, extends downwardly into the trench and is spaced a predetermined distance from the bottom of the trench. This chute is adapted to receive a first material such as sand to form a bottom layer or lift of one type of material. Water is delivered to the material as it is delivered and a vibrating compactor 62 follows to compact the material.

The next hopper or chute 63 includes means for delivering two different materials to the next layer. The chute includes a central pipe or delivery means 64 and an outer chute or wall 65. The bottom of the conveying means or pipe 64 is connected to an inverted troughshaped shield 66 having vertical walls 66a so as to deliver its material within the shield 66 and wall 66a whereby it is deposited in a longitudinal zone having a width corresponding generally to the trough opening 67 and vertical sides. Sand flows downwardly on the outside of the trough and between the wall 66a and wall to lay a pair of longitudinal zones 68 having vertical sides, one on each side of the central longitudinal zone, to form an interface 69 therewith. The provision of a pipe 64 and wall 65 arranged generally parallel to one another pro vides a region of unimpeded flow for the sand. The only impeded flow is at the trough and then it is a converging opening having its narrowest areas at the delivery end. This arrangement provides for good flow and minimizes hold-up. Water is applied during the filling operation and a vibrating compactor 71 serves to compact the zoned layer or lift.

Another hopper or chute substantially identical to that just described delivers another layer including different materials having adjacent longitudinal compacted zones. The same reference numerals are applied to like parts. The final layer or lift includes a chute or hopper 72 which delivers one type of material. The hopper includes inclined or slanted transverse walls 73 which serve to strike off the upper surface of the material so that its surface has the same slope as the canal sides.

Thus, the backfilling of the longitudinal trench with sand and a gravel core is accomplished in four lifts or layers with the upper and lower layers being of one type of material, while the center layers comprise different types of materials with outside strips of said one type of material and a center longitudinal strip of a different type of material.

The dissimilar material is conveyed to the backfill unit from the top of the canal which may be as far as 100 ft. away from the trench. The conveyors are carried by the truss. Referring more particularly to FIGURES 4 and 5, the conveyors pick material from the travelling hopper and deliver the material to the chutes. One conveyor 77 conveys material from one hopper, for example, the gravel hopper, downwardly to a second conveyor 78 which transports the material to a feed chute 76 which discharges into a hopper 79 which distributes the material to the pipes 64 and thence to the inverted troughs for delivery to the center zone. The other conveyor 73 carries the other material, for example, sand, downwardly to and delivers the sand to an oscillating chute 75 which, in turn, delivers the material evenly to a bin 70 disposed above the various chutes to deliver the material to the various chutes 61, 72 and 63. The material is then delivered to form the bottom and top sand lifts and to the shields which direct the material to the side to form zones in the center lifts. Means are provided in conjunction with the oscillating chutes to deflect material and to cause the chute 75 to oscillate or move to evenly fill the bin 70. The bin will fill up when the machine is standing still and backfilling the finger drains. When the machine is in motion, material will feed out the bottom as the machine moves and the conveyors will continuously operate to supply the requisite material to the oscillating chute and bin.

The conveyors 73 and 77 feed the material into chutes 81 and 82 which feed downwardly onto cross conveyors 83 and 84 which feed inwardly into a chute 86 which feeds downwardly onto a conveyor 87 to feed the flowerpot backfiller unit with either sand or gravel. When either of the conveyors 83 and 84 is satisfied, material overflows onto the conveyors 74 and 78.

The flowerpot backfiller unit includes means for delivering dissimilar materials to the flowerpot hole to thereby form a core of one material surrounded by a different material, for example, a core of coarse gravel surrounded by sand.

As previously described, the flowerpot backfill unit is filling the flowerpot associated with the preceding finger drain while the succeeding finger drain is being filled. The flowerpot backfiller is more clearly illustrated in FIG- URES 9-12. The flowerpot backfill unit is mounted for movement on first and second pairs of rails mounted on the truss whereby the unit may be moved in one of two perpendicular directions to thereby provide for locating the unit over the flowerpot hole. On pair of rails is shown at 91, while the second pair of rails is shown at 92.

The flowerpot or sump backfill unit includes a cylindrical wall 93. The upper portion of this cylinder is divided into two chutes 95 and 96 by a vertical wall 94 which extend diametrically across the cylinder. The bottom of the wall 94 merges with a deflector 97 to direct the material into the semi-annular deliver opening 98 defined by the wall 93 and a semi-circular ring 99. A deflector 101 deflects material from the chute into the semi-circular opening 102. A vibratory compactor 103 is carried beneath the deflector 101. The unit is rotated by a motor 106 driving ring sprocket 107 through a chain 108 driven by drive sprocket 109.

The unit is lifted by a lifting assembly as it is rotated. The lifting assembly comprises a hydraulic ram 111 which is connected to sheave block 112. Cables 113 extend between the sheaves 114 carried by the block 112 and the sheaves 116. Actuation of the ram lifts the unit.

In operation, a batch of the first material is initially applied to both chutes 95 and 96 as the assembly is rotated and lifted whereby to provide a bottom layer of one material such as the bottom layer 111, FIGURE 2. Water is simultaneously applied and the compactor compacts. As soon as a suitable thickness is achieved, the chute 95 is filled with a predetermined amount of the other material by actuating the diverter with a hydraulic ram 115 to divert material from the conveyor 87. A charge of material suflficient to form the core is delivered. Material is continuously fed to the chute 96 as the assembly is rotated and lifted. As the unit is lifted, there is continuously deposited adjacent zones or regions of different types of material to form the core. After the charge of material in the center tube is expended, the other material fills the hole. Thus, there is provided means for delivering and filling the hole with two types of material to form contiguous concentric zones having an interface.

As shown in FIGURE 2, there are provided bank stability drains which include a core of one type of material surrounded by a different type of material and having within the core :a drainage pipe. A unit similar to that for filling the longitudinal lining protective drain is employed for backfilling this drain. Such a unit is illustrated in FIGURES 13l6. The unit may comprise a frame 121 which is carried by spaced tracks 122 for moving the frame along the longitudinal bank stability trench The frame 121 serves to carry a hopper 123 which delivers material to associated spaced chutes. There is provided a first chute 126 having a single opening extending downwardly into the trench to lay a first layer of sand. A second chute which follows the first hopper during the first pass over a canal lays a second layer. The second hopper includes :an inner delivery chute 127 which extends down wardly and provides an opening facing into the trench. An inverted trough serves to deflect material applied in the space between the wall 128 of the chute and the outer wall 129 whereby the material is deflected sidewardly and outwardly through openings 131, FIGURES 13 and 15. As the machine is moved forward, a first layer of sand is delivered and then a second layer is delivered which has a central zone of one material and an outer zone of a material of different type. The back shield of the second hopper is shaped to strike off a slight groove for receiving a pipe. The chutes are then detached from the hopper and a new pair of chutes attached. The new pair of chutes deliver third and fourth lifts. The third lift includes zones of sand and gravel. The following or fourth lift is sand. The trench is, therefore, backfilled with a gravel core surrounded by sand. Although not previously described in connection with the other chutes, the strike offs are adjustable, such as shown at 132 and 132a, whereby to strike off at a predetermined level. The strike ofis for the sand and the gravel are independently adjustable and can be set at different elevations to accommodate different compaction of the different materials.

The bank stability trench backfiller may be remote from the materials. For example, it may be located at the bottom of an excavation 136, FIGURE 17, and the source of materials on the bank 137. A material storage bin 138 may be carried for movement along the bank on a suitable frame 139. Material may be fed to the bin by a suitable loading means such as loader 1-41. The material is transferred from the bin 138 by a conveyor 142. The source of material, bin 13S and conveyor 142 move in unison with the backfill unit to deliver material to the backfill hopper 123 so it moves along the trench to backfill it.

Thus, it is seen that there is provided means for filling both longitudinal trenches and holes with different materials. Delivery means extend into the excavations to deliver and maintain separate the two kinds of materials until they are placed. Means are provided for conveying the materials from the top of the bank to the backfill units.

I claim:

1. A machine for simultaneously applying difierent kinds of material to a longitudinal trench comprising a supporting framework, means for supporting the framework for movement in the direction of said trench, conveying means for moving at least two different materials from a source of material, means carried by the supporting framework for delivering the two different kinds of materials to the trench in at least two contiguous zones as it is received from the conveying means, said delivery means comprising means forming at least two discharge openings displaced laterally with respect to each other, said openings adapted to simultaneously receive different materials for depositing the same in laterally displaced zones within the trench.

2. A machine as in claim 1 wherein said discharge openings are each followed by an adjustable strike to independently strike off the delivered material at a predetermined height.

3. A machine for applying different kinds of materials to a trench formed in a canal comprising a supporting framework extending generally parallel to a bank of the canal, means for supporting said framework for movement along the canal, means carried by said framework for delivering two different kinds of material into said trench in at least two contiguous zones, conveyor means carried by said framework for conveying materials from the canal bank to said delivery means, said delivery means comprising means forming at least two discharge openings displaced laterally with respect to each other, at least one opening having a longitudinal divider to receive different materials on its opposite sides for depositing the same in laterally displaced zones within the trench.

4. A machine for applying different kinds of material to a hole formed in a canal comprising a supporting framework extending generally parallel to a bank of the canal, means for supporting said framework for movement along the canal, means carried by said framework for delivering two different kinds of material to the hole in at least two contiguous zones, conveyor means carried by said framework for conveying material from the canal bank to said delivery means, said delivery means two semicircular discharge openings displaced concentrically with respect to each other, said openings adapted to receive different materials for depositing the same in concentrically displaced vertical zones.

5. A machine for simultaneously applying different kinds of material to a longitudinal trench comprising a supporting framework, means for supporting the framework for movement in the direction of said trench, conveying means for moving at least two different materials from a source of material, means carried by the supporting framework for delivering the two different kinds of material into the trench in at least two contiguous zones as it is received from the conveying means, said delivery means comprising means forming at least two discharge openings spaced longitudinally along the trench and disposed at different vertical levels within the trench, at least one of said openings being provided with a divider in alignment with said trench, means for supplying said different materials to the different sides of the divider for depositing the same in separate contiguous zones.

6. A machine for applying different kinds of material to finger drains, flowerpot holes and lining protective trenches in a canal comprising a support framework, means for supporting said framework for movement along the canal with said framework generally parallel to the sloping walls of the canal bank, first means for delivering material to said finger drains, said delivery means being mounted for longitudinal movement on said framework, first conveyor means on said framework for delivering materials from the canal bank to said finger drain delivery means, said conveyor means being of substantially the same length as the longitudinal movement of said finger drain delivery means, means for transferring materials from said first conveyor means to said finger drain delivery means as said finger drain delivery means is moving longitudinally along said framework, second delivery means for delivering different materials to said flowerpot holes, said second delivery means being mounted for limited longitudinal and lateral movement on said framework, said second delivery means including a casing, a partition mounted in said casing, said partition and said casing forming separate compartments for discharging said different materials into separate concentric zones in said hole, conveying means mounted on said framework for conveying two different materials from said canal bank to said second delivery means, third means for delivering different materials to the lining protective trench mounted on a portion of said framework remote from said canal bank, said third means being mounted on said framework for movement therewith, said third means having at least two discharge openings, a partition in at least one of said discharge openings dividing said opening into at least two lateral compartments for discharging different materials into separate contiguous zones, and conveying means mounted on said framework for conveying two dilferent materials from said canal bank to said third delivery means.

7. A device for filling an elongated excavation in the side wall of a canal, comprising an elongated framework extending the width of said side wall, a material supply means mounted at one end of said supporting framework, filling means mounted for movement along said support framework, said filling means including material discharge means in alignment with said excavation, means connected to said filling means for moving it along said framework, conveying means mounted on said elongated framework for moving material from said material supply to said filling means as said filling means is moved along said framework, said conveying means including a longitudinal conveyor extending substantially the entire length of the framework, said longitudinal conveyor including a tripper connected to said filling means for movement therewith, a transverse conveyor mounted on said framework below said tripper for moving material from said longitudinal conveyor to said filling means as it falls from said tripper.

8. A device for filling a circular hole in a side wall in a canal with at least two different materials comprising a supporting framework, filling means mounted for limited longitudinal and lateral movement of said framework, said filling means including a hopper and a discharge casing disposed below said hopper, means for rotating said casing, a partition mounted in said casing and dividing it into at least two concentric compartments, material supply means mounted at one end of said supporting framework, a material supply including at least two different materials, conveying means mounted on said framework for delivering said different materials from said supply means to said filling means and diverting means pivot-ally mounted in said hopper having a first and second position for receiving different materials from said hopper to said compartments for discharge into contiguous concentric zones in said hole.

9. A device for filling a trench with two different materials comprising support means, means for moving said support means along said trench, means mounted to said support means for supplying different materials to said trench, said supply means comprising a first material inlet and a second material inlet, at least two outlets for delivering material to said trench, one of said outlets being provided With a divider in alignment with said trench, means for supplying said first material to one side of said divider, means for supplying said second material to another side of said divider so that said first and second materials will be discharged into said trench in at least two contiguous laterally displaced zones.

References Cited UNITED STATES PATENTS Jaeger 94-46 West 94-46 Jackson 94-46 X Holter 94-46 X Joedicke 94-46 X Jackson 94-44 McConnaughay 94-44 Durston 94-44 X JACOB L. NACKENOFF, Primary Examiner.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3 ,342 ,035 September 19 1967 Dwight B. Sale It is hereby certified that error appears in the above numbered patent requiring correction and that the said Letters Patent should read as corrected below.

Column 2, line 21, for "trenches and flowpot" read trencher and flower pot column 5, line 26, for "pick" read pick up column 6, line 3, for "deliver" read delivery column 7, line 59, before "two" insert comprising 1 Signed and sealed this 12th day of November 1968.

(SEAL) Attest:

EDWARD J. BRENNER Commissioner of Patents Edward M. Fletcher, Jr.

Attesting Officer 

1. A MACHINE FOR SIMULATANEOUSLY APPLYING DIFFERENT KINDS OF MATERIAL TO A LONGITUDINAL TRENCH COMPRISING A SUPPORTING FRAMEWORK, MEANS FOR SUPPORTING THE FRAMEWORK FOR MOVEMENT IN THE DIRECTION OF SAID TRENCH, CONVEYING MEANS FOR MOVING AT LEAST TWO DIFFERENT MATERIALS FROM A SOURCE OF MATERIAL, MEANS CARRIED BY THE SUPPORTING FRAMEWORK FOR DELIVERING THE TWO DIFFERENT KINDS OF MATERIALS TO THE TRENCH IN AT LEAST TWO CONTIGUOUS ZONES AS IT IS RECEIVED FROM THE CONVEYING MEANS, SAID DELIVERY MEANS COMPRISING MEANS FORMING AT LEAST TWO DISCHARGE OPENINGS DISPLACED LATERALLY WITH RESPECT TO EACH OTHER, SAID OPENINGS ADAPTED TO SIMULTANEOUSLY RECEIVE DIFFERENT MATERIALS FOR DEPOSITING THE SAME IN LATERALLY DISPLACED ZONES WITHIN THE TRENCH. 